lcd1602.c

这是一个成熟的DSA通讯持续,可以在单片机之间通讯用.

#include"lcd1602.h"
#include"delay.h"

///////////////////////////////////////////////////////////////////////////////

void LCD_en_write(void)  //液晶使能
{
  LCD_EN_PORT=LCD_EN;
  delay_nus(10);
  LCD_EN_PORT=!LCD_EN;
}

///////////////////////////////////////////////////////////////////////////////

void LCD_write_command(unsigned char command) //写指令
{
  delay_nus(16);
  LCD_RS_PORT=!LCD_RS;         //RS=0
  LCD_DATA_PORT&=0X0f;         //清高四位
  LCD_DATA_PORT|=command&0xf0; //写高四位
  LCD_en_write();
  delay_nus(30);
  command=command<<4;          //低四位移到高四位
  LCD_DATA_PORT&=0x0f;         //清高四位
  LCD_DATA_PORT|=command&0xf0; //写低四位
  LCD_en_write();
  delay_nus(30);
}

///////////////////////////////////////////////////////////////////////////////

void LCD_write_data(unsigned char Adata) //写数据
{
  delay_nus(16);
  LCD_RS_PORT=LCD_RS;         //RS=1
  LCD_DATA_PORT&=0X0f;        //清高四位
  LCD_DATA_PORT|=Adata&0xf0;  //写高四位
  LCD_en_write();
  //delay_nus(30);
  Adata=Adata<<4;             //低四位移到高四位
  LCD_DATA_PORT&=0X0f;        //清高四位
  LCD_DATA_PORT|=Adata&0xf0;  //写低四位
  LCD_en_write();
  delay_nus(30);
}

///////////////////////////////////////////////////////////////////////////////

void LCD_set_xy( unsigned char x, unsigned char y )  //写地址函数
{
    unsigned char address;
    if (y == 0) 
       address = 0x80 + x;
    else   
       address = 0xc0 + x;
    LCD_write_command( address);
    delay_nus(30);
}

////////////////////////////////////////////////////////////////////////////////

void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) 
{
    LCD_set_xy( X, Y ); //写地址  
    while (*s)  // 写显示字符
    {
      LCD_write_data( *s );
      s ++;
    }
      
}

//////////////////////////////////////////////////////////////////////////////

void LCD_write_char(unsigned char X,unsigned char Y,unsigned char Adata) 
{
  LCD_set_xy( X, Y ); //写地址
  delay_nus(30);
  LCD_write_data(Adata);
  
}

///////////////////////////////////////////////////////////////////////////////
void LCD_init(void)         //液晶初始化
{
  LCD_write_command(0x28); 
  LCD_en_write();
  delay_nus(40);
  LCD_write_command(0x28);  //4位显示
  delay_nus(3);
  LCD_write_command(0x0c);  //显示开
  delay_nus(3);
  LCD_write_command(0x01);  //清屏
  delay_nus(3000);
//  delay_nus(3000);
}

/*------------------------------------------------
16进制转换为10进制
-------------------------------------------------*/

uchar hexotd(uchar hexdata)
{
  return   (hexdata&0x01)+ ((hexdata&0x02)>>1)*2+ ((hexdata&0x04)>>2)*4+  ((hexdata&0x08)>>3)*8+ ((hexdata&0x10)>>4)*16+ ((hexdata&0x20)>>5)*32;
}
#if 0
/*------------------------------------------------
时间的显示
-------------------------------------------------*/
void disp_time(uchar x,uchar y,uchar dat)
{
  uchar disp_dat;
  uchar d2,d3;
  disp_dat=hexotd(dat);

	   if(disp_dat>=10)
	   {
	    d2=disp_dat/10;
		d3=disp_dat%10;

	    LCD_write_char((y),x,(d2+48));
	    LCD_write_char((y+1),x,(d3+48));	   	   
	   }
	   else
	     {
	       LCD_write_char((y),x,'0');
	       LCD_write_char((y+1),x,(disp_dat+48));	   	   
	     }
}
#endif

/*------------------------------------------------
数据的显示
------------------------------------------------	  */
void disp_hex(uchar x,uchar y,uchar hex)
{
   uchar dat;
   dat=disp_char((hex&0xf0)>>4);
//   LCD_write_char(y,x,disp_char((hex&0xf0)>>4));
   LCD_write_char(y,x,dat);
   dat=disp_char(hex&0x0f);
   LCD_write_char((y+1),x,dat);

}
/*------------------------------------------------
16进制显示
-------------------------------------------------*/
uchar disp_char(uchar dat)
{
  uchar num;

  switch(dat)
  {
    case 0x00:
		  num=48;
		  break;  
    case 0x01:
		  num=49;
		  break;          
  	case 0x02:
		  num=50;
		  break;  
	case 0x03:
		  num=51;
		  break;  
	case 0x04:
		  num=52;
		  break;  
	case 0x05:
		  num=53;
		  break;  
	case 0x06:
		  num=54;
		  break;  
	case 0x07:
		  num=55;
		  break;  
	case 0x08:
		  num=56;
		  break; 
	case 0x09:
		  num=57;
		  break;          
  	case 0x0A:
		  num=65;
		  break;  
	case 0x0B:
		  num=66;
		  break;  
	case 0x0C:
		  num=67;
		  break;  
	case 0x0D:
		  num=68;
		  break;  
	case 0x0E:
		  num=69;
		  break;  
	case 0x0F:
		  num=70;
		  break;         
  }
   return num;	
}
/*------------------------------------------------
数据的显示
------------------------------------------------	  */

void disp_dat(uchar x,uchar y,uchar dat)
{
  uchar disp_dat;
  uchar d1,d2,d3;
  disp_dat=hexotd(dat);

  if(disp_dat>=100)
     {
	  d1=disp_dat/100;
	  d2=(disp_dat-d1*100)/10;
	  d3=disp_dat%10;

	  LCD_write_char(y,x,(d1+48));
	  LCD_write_char((y+1),x,(d2+48));
	  LCD_write_char((y+2),x,(d3+48));	 
	 }
	 else
	   if(disp_dat>=10)
	   {
	    d2=disp_dat/10;
		d3=disp_dat%10;

	    LCD_write_char(y,x,' ');
	    LCD_write_char((y+1),x,(d2+48));
	    LCD_write_char((y+2),x,(d3+48));	   	   
	   }
	   else
	     {
	       LCD_write_char(y,x,' ');
	       LCD_write_char((y+1),x,' ');
	       LCD_write_char((y+2),x,(disp_dat+48));	   	   
	     }


}